Net Income (Loss) Per Share (Additional Information) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 9,259	$ (14,037)	$ 105,681	$ (124,862)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	9,259	(20,720)	6,209	(140,396)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	$ 0	$ 6,683	$ 99,472	$ 15,534
Weighted Average Number of Shares Outstanding, Basic	285,942	292,663	285,064	292,703
Dilutive Securities, Effect on Basic Earnings Per Share	2,706	0	3,089	0
Weighted Average Number of Shares Outstanding, Diluted	288,648	292,663	288,153	292,703
Earnings Per Share, Basic	$ 0.03	$ (0.05)	$ 0.37	$ (0.43)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0.02	0.35	0.05
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.03	$ (0.07)	$ 0.02	$ (0.48)
Weighted Average Number of Shares, Contingently Issuable	2,555	1,975	2,542	1,801
Income (Loss) from Continuing Operations, Per Diluted Share	$ 0.03	$ (0.07)	$ 0.02	$ (0.48)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0	0.02	0.35	0.05
Earnings Per Share, Diluted	$ 0.03	$ (0.05)	$ 0.37	$ (0.43)
Anti-dilutive common equivalent shares excluded from computation of diluted net income (loss) per share	527	4,408	673	3,838

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration